Well, because there's a lot of fanboys trying to downplay the switch selling a shit ton by calling it a handheld. They don't explicitly say it, but calling it a handheld puts it in another market where it can't compete with the PS5 and Xbox, making it "fair". You have a thread where someone was judging Nintendo on counting the Switch lite sales in the overall Switch total sales, like it's not "fair".
It's like, "the Switch doesn't matter because it doesn't compete with my PS5, so PS5 is first" kinda thing. But the thing is - the Switch is a console, hybrid one, competing with other home consoles. People can call it whatever they want, if it makes them sleep better at night, but Nintendo is fucking killing it.
I'm one of the people arguing that it's a handheld, but it's not so "my console can win". I'm a PC gamer mostly, but I have the PS5, PS4, XBO, XSX, and the Switch. I don't care who "wins". I was just irritated that they phrased it as "home console" instead of "handheld console". There is a difference in the terms. Having said that, calling it a handheld console doesn't somehow negate the success of the Switch. Over 100 million sold is an impressive feat weather it's a home console or a handheld console. Either way it's a non-PC gaming device, and that many sales deserves credit.